Science & Environment
Empirical & Molecular Formula Calculator
Determine the empirical and molecular formula ratio of a two-element compound from percent mass.
Your inputs
Change any value to update the result instantly.
Empirical formula ratio (A:B)
1
Ratio of B
17.87
Empirical formula mass
30.025 g/mol
Molecular formula multiplier
6 ×
Formula and working
moles = %mass ÷ atomic mass; divide by smallest mole value for ratio
- 1
Collect the inputs
Percent mass of element A = 40 %; Atomic mass of A = 12.01 g/mol; Atomic mass of B = 1.008 g/mol; Actual molar mass of compound = 180 g/mol
- 2
Apply the formula
moles = %mass ÷ atomic mass; divide by smallest mole value for ratio
- 3
Result
Empirical formula ratio (A:B) = 1
Frequently asked questions
Important limitation
This is an educational estimate based only on the values and formula shown. Verify current rates, rules, units, and professional standards before relying on the result. It is not personalized financial or investment advice.
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